Variable delivery rotary pump



1949- J. w. F. HOLL VARIABLE DELIVERY ROTARY PUMP 2 Sheets-Sheet 1 Original Filed Oct. 14, 1940 INYENTOR, Jams MI." 01.1.. BY 7i '4TTORNEY.

1949- J. w. F. HOLL VARIABLE DELIVERY ROTARY PUMP 2 Sheets-Sheet Original Filed Oct. 14, 1940 I N YE N TOR. James V F Ho.

17 T TORNE).

VARIABLE DELIVERY ROTARY PUMP James W. F. Boll, Los Angeles, Calif.

Original N 0.

2,359,558, dated October 3, 1944, Se-

rial No. 361,063, October 14, 1940. Application for reissue October 1, 1945, Serial No. 619,535

11 Claims. (Cl. 103120) This invention relates to a variable delivery rotary pump, the prime object 01' which is to provide a simple and eilective means of varying the delivery of the pump by means oi an exterior lever or arm.

Another object of my invention is to provide a novel means of varying the delivery of a rotary pump by rotation either of an eccentric in the pump or a ported plate.

Another object of my invention is to provide a novel means of compensating for wear and heating expansion of parts by internal hydraulic pressure against the rotor and other parts within the pump.

A feature of my invention resides in the novel blade arrangement in the rotor whereby these blades are urged against the wall the pumping chamber by a resilient means and are also urged against the side walls of the chamber, thus enabling the pump to efllciently operate at low speeds.

Still another object of my invention is to provide a novel variable delivery rotary pump, which is also reversible by operation of an external arm or lever.

A feature of my invention resides in the ability to adjust the pump to any point between zero output and full output.

Other objects, advantages and features of invention may appear from the accompanying drawings. the subjoined detailed description, and the appended claims.

In the drawings:

Figure 1 is a longitudinal, sectional view taken in a vertical plane oi my pump.

Figure 2 is an end view of the rotor.

Figure 3 is a fragmentary, vertical sectional view of the rotor.

Figure 4 is an end view of the delivery changing finger or actuator.

Figure 5 is a fragmentary. side elevation oi the same.

Figure 6 is a side elevation of the ported plate.

Figure '7 is a vertical, sectional view of the same.

Figure 8 is a transverse, sectional view of the eccentric.

Figure 9 is an end view of the same.

Figure 10 is a vertical, sectional view of a slightly modified form of variable delivery pump embodying my invention.

Figure 11 is an end view oi the rotor.

Figure 12 is a vertical sectional view of the same.

Figure 13 is a side elevation of blade pack.

Figure 14 is an end view of the same.

Figure 15 is an end view of the housing with the bearing portion oi the housing removed, and also the rotor removed.

Figure 16 is a view similar to Figure 15 but with the rotor in position.

Figure 17 is a side elevation of the ported and adiustable plate.

Figure 1B is a vertical, sectional view 01 the same.

Referring more particularly to the drawings, the numeral I indicates a housing in which a chamber 2 is formed. The open end oi the chamber 2 is closed by a head 3, which is bolted or otherwise fixedly attached to the end of the housing I. A rotor head 4 is formed or fixedly mounted on the end of a shaft 5, the shaft protruding from the housing i and the head being positioned within the chamber 2 and rotatable therein, all of which is usual in the art. A suitable driving means is attached or connected to the shai't I at its outer end so as to rotate the runner or head Q. It is understood that the driving connection to the shaft 5 shall permit longitudinal movement of this shaft in the housing ithat is, the shalt and head i will float. The purpose 01 this is to permit a sealing against the side walls of the rotor, as will be subsequently described.

A plurality of blades 6 are mounted in the head 4 in proper spaced relation, and these blades may be radially arranged. and also they may consist or a single block of metal, fiber. or the like, or they may be formed 0! a plurality of segments or strips, as will be subsequently described. An annular resilient ring 1 engages each oi the blades ii and urges these blades outwardly against the wall of the pumping chamber. It will be noted that the head 4 is undercut, as shown at 8, and the resilient spring or element I is positioned within this undercut portion so as to engage substantially the center of each 0! the blades I. Each oi. the blades may be recessed or grooved to receive the spring element I, thus insuring an even outward push against these blades, and the grooves also serving to retain the spring I in position.

An eccentric cylindrical pump wall sleeve l is mounted in the chamber 2 and closely fits the wall of this chamber, that is the outer surface of the eccentric wall flts the chamber 2. The eccentric cylindrical pump wall sleeve I which is concentrically disposed in chamber 2 and has an inner periphery which is eccentric to the axis of the housing and its chamber and is rotatable within the chamber 2, as will be further described. The rotor 4 is positioned within the eccentric sleeve I, and the blades 6 are pressed against the inner wall 01' the eccentric. A plate II is mounted within the chamber 2 and positioned at the end of this chamber. the eccentric sleeve I being pressed endwise against this plate in a manner to be described in the following paragraphs. The plate iii is provided with an arcuate intake port Ii, and an arcuate exhaust port l2. An intake duct II is provided in the ward1y. This hydraulic housing and this duct extends to the port II, and similarly an outlet duct I4 is provided in the housing, this outlet duct extending to the port l2, The plate Ill is pinned to the housing i so that it cannot rotate. Rotation of the eccentric sleeve 8 over the ports II and |2 will vary the delivery of the pump by varying the extent of opening of the ports and by varying the position of the high and low pressure sides of the pump with respect to the ports.

A cup l3 fits closely within the eccentric 2 and bears against the end of the rotor 4, substantially as shown in Fig. 4. Rotation of the eccentric sleeve 9 and the cup II is accomplished by the adjusting shaft l4, which extends through the head 3. A lever or arm- I! attached to the outer end of the shaft |4' enables this shaft to be rotated for the purpose of adjusting the delivery or the pump. on the inner end of the adjusting shaft N, there is fixedly attached or integrally formed a spring finger l8. This spring finger extends outwardly and fits into notches II in the eccentric, thus causing the eccentric to rotate when the arm I! is swung. The spring finger I8 is also adapted to press the eccentric sleeve 9 endwise against the plate ID for the purpose of providing a fluid-tight seal therebetween. As will be discussed in more detail hereinafter, fluid under pressure also acts on the end of the eccentric sleeve 9 adjacent the spring flnger IE to assist the spring finger in retaining the opposite end thereof in fluid-tight engagement with the plate Hi. The outer surface of the eccentric 9 is concentric with the shaft 5, and the eccentric is rotatable about the axes of the shafts 5 and I4, The shafts 5 and H are preferably in alignment.

A pressure duct Ill is formed in the housing I and extends from the outlet l4. A port I! extends back of the finger l6-and within the cup i3, thus introducing fiuid under pressure back of the cup i3, and pressing this cup against the side of the rotor 4. The fluid under pressure also acts on the end of the eccentric sleeve 9 nearest the spring finger l8 to urge the opposite end of the sleeve into fluid-tight engagement with the plate lb. The cup i3 is also bled into the center of the rotor 4 by passage or port l3", thereby introducing fiuid under pressure into the rotor, which will assist in pressing the blades 6 outpressure will also hold the rotor 4 against the plate Ill at all times and will compensate for wear. The spring finger l5, as well as hydraulic pressure, will press the cup l3 against the rotor, also for the purpose of compensating for wear.

The shaft 5 is journaled in the housing I and an oil seal 20, of usual and well-known construction, is provided at the outer end of the housing I and surrounds the shaft 5. A port 2| extends from the oil seal 20 to the intake ll of the pump for the purpose of returning any excess oil which might accumulate from the bearing of the shaft 5.

In the type of pump thus far described, and disclosed in Figures 1 to 9 inclusive, the ported plate in which the inlet and outlet ports are provided is stationary, and an eccentric is rotatably mounted adjacent to this ported plate, the end of the eccentric bearing against the plate and rotation of the eccentric will vary the size of the inlet and outlet ports through which fluid is permitted to pass.

In Figures 10 to 18 inclusive the variable delivery pump consists of a housing 22, to which a. bearing head '23 is bolted or otherwise removably attached, A pumping chamber 24 is provided in the housing 22, and a sleeve 28 oi hard material is pressed into this chamber for the purpose of presenting a hard-wearing surface for the rotor. The rotor includes a head 26, which is formed or mounted on the end of a shaft 21. The shaft is Journaled in the bearing case 23, and is preferably splined internally to receive a suitable driving coupling 28. The head 26 is provided with a plurality of slots 28, which receive blade packs 30. These blade packs consist of a plurality of thin strips of metal, fiber or the like, each strip being arranged in pairs which are cut angularly as shown at 3|, so that outward pressure against the blade pack will cause the parts of the blades to be pushed sideways against the side wall of the pumping chamber. This provides a side wall seal. The cuts 3| may be alternately arranged in the blade packs so as to prevent leakage through the blade packs. The head 26 is undercut, as shown at 22, and an annular resilient element It bears against each of the blade packs for the purpose of urging these blades outwardly. It is to be noted that the head 28 is eccentrically mounted in the chamber 24. The blade packs 30 are curved to receive the spring element 33 the same as previously described in Figures 1 to 9 inclusive.

The head 26 is also provided with annular grooves 34 and 35 in each wall thereof to provide an oil seal, Note also that the head is rounded, particularly at the inner end thereof, as shown at 28. This allows fiuid carry-over by way of this rounded area between the blades. The housing 22 is provided with ports 21 and 38, either of which may be the intake or the outlet. The port 31 extends to an annular groove 39 in the end wall of the housing 22, and the port 38 extends to an annular groove or passage 40 also in the end wall of the housing. A plate 4| is positioned within the chamber 24, and is mounted or fixed to the inner end or an adjusting shaft 42. An adjusting arm or lever 43 is fixed to the shaft 42 for the purpose of rotating this shaft and the ported plate 4| for the purpose of varying the delivery of the pump.

The plate 4| is provided with arcuate ports 44 and 45, which coincide with the annular grooves 39 and 40 respectively. Thus. it will be evident that rotation of the shaft 42 and the plate 4| will vary the position of the arcuate ports 44 and 45 relative to the eccentrically mounted rotor 26, thus varying the delivery of the pump by varying the positions of the ports with respect to the high and low pressure sides of the pump. A degree rotation will completely reverse the flow of fluid to and from the pump. A bleed port 46 is formed in the shaft 42 and extends into the chamber 24 for the purpose of introducing fluid under pressure back of the blades 3|! for the purpose of urging these blades outwardly against the wall of the chamber 24. The port 48 will connect with either of the ducts 41 or 48, depending upon which is the pressure side of the pump. An oil seal 49 is provided at the outer end of the bearing housing 23 and this seal is of usual and well-known construction.

I claim:

1. A variable delivery rotary pump comprising a housing having a chamber therein and inlet and outlet ports communicating with an end of the chamber, a rotatable sleeve having an internal eccentric periphery positioned in said chamber and defining eccentric sleeve ends, a longitudinally shiftable rotor having a, plurality of blades positioned within said sleeve, means connected as,ose

to said rotor to eil'ect driving or the same, a plate having ports therein disposed between said rotor and the end of said chamber with which the ports of the housing communicate and having its ports communicating with the housing ports, the respective end of said sleeve bearing against said plate, said respective end 01' said sleeve being arranged upon rotation thereof to cover and uncover to varying degrees said plate ports to control the extent of opening oi said plate ports and consequently the fluid flow through said inlet and outlet ports, a cup slidably disposed in said sleeve adjacent the opposite end thereof and engageable by said rotor and shiftable therewith longitudinally in the sleeve, and means for turning said sleeve whereby the flow through the respective inlet and outlet ports may be varied, the housing being provided with a passage leading from its outlet port for delivering fluid under pressure against the cup and efl'ecting shifting of the cup against the rotor in the sleeve toward the ported end of the chamber.

2. A variable delivery rotary pump comprising a housing having a chamber therein and inlet and outlet ports communicating with one end of the chamber in spaced relation to each other circumferentially thereof, a rotatable sleeve hav-- ing an internal eccentric periphery positioned in said chamber and defining eccentric sleeve ends. a hollow longitudinally movable rotor having a plurality of blades positioned within said sleeve, means connected to said rotor to eil'ect driving oi the same, a plate having ports therein between said rotor and one end of said chamber. the respective end oi said sleeve thus bearing against said plate, said plate ports respectively communicating with said housing ports, said respective said plate ports to control the extent or opening and consequently the fluid flow through said inlet and outlet ports. a cup slidably disposed in said sleeve adjacent the opposite end thereof and engageable by said rotor, a bleed port formed through the bottom of said cup providing communication between the interior of the cup and the hollow rotor, the housing being formed with a port between the cup and one 01 for wear thereof. sleeve whereby the flow through the respective inlet and outlet ports may be varied.

3. In a rotary the combination of: a housing having a chamber therein and having inlet and outlet ports therein which communicate with said chamber, said housing having a municate with said inlet and outlet ports in said housing, respectively; a rotatable sleeve disposed in said chamber between said plate and said location at which said passage communicates with said chamber. said sleeve having an eccentric internal periphery and having an eccentric end which is adapted to engage said plate, said eccentric end being adapted to vary the opening of said inlet and outlet ports in said plate upon rotation of said sleeve; means for rotating said sleeve; a

longitudinally movable rotor disposed in said sleeve, said rotor being rotatable about the axis or said chamber and being adapted for slidable engagement with said plate; a plurality of blades carried by said rotor. said blades slidably engaging said eccentric internal periphery of said sleeve and being radially movable with respect to the axis of said chamber; a, longitudinally movable, cup-shaped member slidably disposed in said sleeve, said member being adapted for engagement with said rotor and said blades to urge said rotor and said blades into engagement with said plate; an means for rotating said rotor whereby fluid flows through said outlet port in said housing and through said passage into said chamber to act on said member, thereby moving said member longitudinally into engagement with said rotor to urge said rotor and said blades into engagement with said plate.

4. A rotary pump as defined in claim 3 in which said cup-shaped member is provided with a bleed port therethrough whereby fluid acting on said member flows through said bleed port and acts on said rotor to urge said rotor into engagement with said plate.

5. In a rotary pump, the combination of: a housing provided with a chamber therein and having inlet and outlet ports therein which communicate with the interior of said chamber; a sleeve in said chamber having an internal periphery which is eccentric with respect to the longitudinal axis of said chamber. one end of chamber; a rotor in said sleeve engaging said one end wall of said chamber, said rotor being rotatable about said longitudinal axis of said chamber; a plurality of blades carried by said rotor, said blades engaging said eccentric internal periphery of said sleeve and said one end wall oi said chamber and being movable radially with respect to said longitudinal axis of said chamber; a wall member spaced from said other end wall of said chamber and sealably engaging said sleeve, said rotor, and said blades; means connected to said rotor for eii'ecting rotation thereof so as to deliver fluid under pressure through said outlet port; and passage means for conducting a portion of the fluid under pressure delivered by the pump into said space between said other end of said sleeve and said other end wall of said chamber whereby the fluid acts on said other end 01 said sleeve to retain said one end thereof in engagement with said one end wall of said chamber.

6. A rotary pump according to claim 5 wherein said wall member and said rotor are movable longitudinally, said wall member engaging said eccentric internal periphery of said sleeve, and said space between said well member and said other end wall of said chamber communicating with said space between said other end of said sleeve and said other end wall of said chamber, whereby the fluid under pressure conducted into said space between said other end of said sleeve and said other end wall of said chamber also acts on said wall member to retain it in fluidtight engagement with said rotor and said blades and to retain said rotor and said blades in fluidtight engagement with said one end wall oi said chamber.

'7. In a variable delivery rotary pump, the combination of: a housing provided with a chamber therein and having inlet and outlet ports therein for a fluid which communicate with said chamher; a rotatable sleeve in said chamber, said sleeve having an eccentric internal periphery symmetrical about an axis which is parallel to and spaced from the longitudinal axis of said chamber, said sleeve being adapted upon rotation thereof to vary of opening of said inlet and outlet rotating said sleeve; a rotor in rotatable about an axis which is parallel to and spaced from said axis about which said eccentric internal periphery of said sleeve is symmetrical, said rotor being movable along said axis of rotation thereof and bein adapted to engage one end wall of said chamber; a plurality of blades carried by said rotor and movable radially with respect to said axis of rotation thereof, said blades engaging said eccentric internal periphery of said sleeve and being adapted to engage said one end wall of said chamber; a wall member which is disposed in and is movable longitudinally of said sleeve and which is spaced from the other end wall of said chamber, said wall member engaging said eccentric internal periphery of said sleeve and being said blades; connected to said rotor for eflecting rotation thereof whereby fluid under pressure is delivered through said outlet port; and passage means for conducting a portion of the fluid under pressure delivered by the pump into said space between said other end wall of said chamber and said movable wall member whereby the fluid acts on said movable wall member to urge it into engagement with said rotor and said blades and to urge said rotor and said blades into engagement with said one end wall of said chamber.

8. A variable delivery rotary pump according to claim "I wherein said movable wall member is provided with a passage therethrough communieating with said space, and wherein said rotor is provided with an opening therein communicating with said passage and exposing the inner ends of said blades, whereby fluid under pressure flows from said space into said opening in said rotor by way of said passage through said movable wall member and acts on said inner ends of said blades to urge said blades outwardly into engagement with said eccentric internal periphery of said sleeve to provide a fluid-tight seal therebetween.

9. In a variable delivery rotary pump, the combination of: a housing provided with a cylindrical opening therein and having inlet and outlet ports in one end wall of said opening; a rotatable sleeve in said opening, said sleeve having an eccentric internal periphery defining a pumping chamber which is symmetrical about an axis spaced from and parallel to the axis of said opening, the position of said pumping chamber relative to said inlet and outlet ports varying upon rotation of said sleeve; a rotor in said sleeve, said rotor being rotatable about an axis which is spaced from and paralle to said axis of said pumpin chamber; a plurality of blades carried by said rotor and movable radially with respect to said axis of rotation thereof, said blades slidably engaging said one end wall of said opening and said eccentric internal periphery of said sleeve; a wall member which is disposed in and is movable longitudinaly of said sleeve and which is spaced from the other end wall of said chamber, said wail member engaging said eccentric internal periphery of said sleeve and being adapted to engage said blades; means operatlvely connected to said rotor for efiecting rotation thereof whereby fluid under pressure is delivered through said outlet port;

Ill]

passage means for conducting a portion of the fluid under pressure delivered by the pump into said space between said other end wall of said chamber and said movable wall member whereby the fluid acts on said movable wall member to urge it into engagement with said blades; and means for rotating said sleeve to vary the position of said pumping chamber with respect to said inlet and outlet ports whereby to vary-the delivery of the pump.

10. In a device of the character described, the combination of z. a housing provided with a cylindrlcal opening therein and having fluid inlet and outlet ports therein which communicate with said opening; a rotatable sleeve in said opening, said sleeve having an eccentric internal periphery defining a pumping chamber which is symmetrical about an axis spaced from and parallel to the axis of said opening, said sleeve being adapted, upon rotation thereof. to vary the position of said pumping chamber relative to said sleeve about a rotor axis which is parallel to and spaced from the axis of symmetry of said pumping chamber and shiftable in said pumping chamber along said rotor axis, said rotor being adapted to engage one end wall of said opening; a plurality of blades carried by said rotor and movable radially with respect to said rotor axis, said blades engaging said eccentric internal periphery of said sleeve and being adapted to engage said one end wall of said opening; a wall member which is disposed in and is movable longitudinally of said sleeve and which is spaced from the other end wall of said chamber, said wall member being adapted to engage said rotor and said blades; and passage means connecting one of said ports with said space between said other end wall of said opening and said movable wall member to admit fluid from said one port into said space, whereby the fluid in said space acts on said movable wall member to urge it into engagement with said rotor and said blades and to urge said rotor and said blades into engagement with said one end wall of said opening.

11. A device as set forth in claim 10 wherein said sleeve is spaced from said other end wall of said opening and wherein said passage means connects said one port with said space between said sleeve and said other end wall of said opening to apply fluid pressure to said sleeve to urge it into engagement with said one end wall of said op ning.

JAMES W. F. HOLL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 944,708 Vollmann Dec. 28, 1909 1,074,096 Hammer Sept. 23, 1913 1,087,191 Pitman Feb. 17, 1914 1,475,693 Carrey Nov. 2'1, 1923 1,943,929 Rayburn Jan. 16, 1934 2,206,384 Adler July 2, 1940 2,312,891 Ferris Mar. 2, 1948 2,423,271 Talbot July 1, 1947 FOREIGN PATENTS Number Country Date 7,464 Great Britain 1913 19,080 Great Britain 1912 261,248 Germany 1912 695,93! Germany 1939 Certificate of Correction Reissue No. 23,086. February 22, 1949.

JAMES 1W. FQ'HOLL It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 6, line 13, claim 3, for the words an means read and means; line 18, same claim, after rotor" first occurrence, insert and said blades; column 8, line 64, list of references cited, after Nov. 27, 1923, insert the following:

1,737,942 Pagel -Dec. 3, 1929 and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 23rd day of August, A. D. 1949.

THOMAS F. MURPHY,

Assistant Gammz'ssioner of Patents. 

